Programming Examples

Java program to rotation input matrix 90 degree and print


Write a  program  to  declare  a  square  matrix  A[  ][  ]  of  order  MxM  where  'M'  is  the  number  of  rows  and  the  number  of  columns,  such  that  M  must  be  greater  than  2  and    less  than 10.  Accept  the  value  of  M  as  user  input.  Display  an  appropriate  message  for    an  invalid  input.  Allow  the  user  to  input  integers   into   this   matrix.   Perform   the   following tasks:

(a) Display the original matrix.

(b) Rotate the matrix 90° clockwise as shown below:

Original matrix

 

1 2 3

4 5 6

7 8 9

 

Rotated matrix

7 4 1

8 5 2

9 6 3

 

(c) Find the sum of the elements of the four comers of the matrix.

Test your program with the sample data and some random data: Example 1

INPUT : M = 3

3 4 9

2 5 8

1 6 7

OUTPUT :

ORIGINAL MATRIX

3 4 9

2 5 8

1 6 7

MATRIX AFTER ROTATION

1 2 3

6 5 4

7 8 9

Sum of the corner elements = 20

Example 2

INPUT : M = 4

1 2 4 9

2 5 8 3

1 6 7 4

3 7 6 5

OUTPUT :

ORIGINAL MATRIX

1 2 4 9

2 5 8 3

1 6 7 4

3 7 6 5

MATRIX AFTER ROTATION
3 1 2 1
7 6 5 2
6 7 8 4
5 4 3 9
Sum of the corner elements = 18
Solution

import java.util.*;
class Rotate90
{
	public static void main(String arr[])
	{
		int matrix[][]=new int[10][10];
		int m,a,b;
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter the Value of M : ");
		m=sc.nextInt();
		System.out.println("Enter "+(m*m)+" Elements for Matrix : ");
		for(a=0;a<m;a++)
		{
			for(b=0;b<m;b++)
			{
				matrix[a][b]=sc.nextInt();
			}
		}
		System.out.println("Original Matrix :");
		for(a=0;a<m;a++)
		{
			for(b=0;b<m;b++)
			{
				System.out.print(matrix[a][b]+"  ");
			}
			System.out.println();
		}


		// Rotate a Matrix anti clock wise 90 degree
		for (int x = 0; x < m / 2; x++) 
		{
 
			for (int y = x; y < m - x - 1; y++) 
			{
			int temp = matrix[x][y];
			matrix[x][y] = matrix[y][m - 1 - x];
			matrix[y][m - 1 - x]= matrix[m - 1 - x][m - 1 - y];
			matrix[m - 1 - x][m - 1 - y] = matrix[m - 1 - y][x];
			matrix[m - 1 - y][x] = temp;
			}
		}
		
		System.out.println("Matrix After Rotate 90 Degree:");
		for(a=0;a<m;a++)
		{
			for(b=0;b<m;b++)
			{
				System.out.print(matrix[a][b]+"  ");
			}
			System.out.println();
		}
	
	}
}
Output

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